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  <!-- 
    之前使用字体图标 阿里巴巴矢量图标库 span class = 'iconfont icon-xx' 早之前的浏览器
    对svg标签支持不够友好  随着浏览器逐渐更新 现在主流浏览器都基本支持了svg标签
    
    viewBox='0 0 128 128' 水平的偏移值 垂直的偏移值  默认的宽度和高度
    只有写了viewBox 才可以修改svg
     fill属性史修改颜色
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  <svg viewBox = '0 0 300 300' width="128" height="128" xmlns="http://www.w3.org/2000/svg">
    <path d="M115.625 127.937H.063V12.375h57.781v12.374H12.438v90.813h90.813V70.156h12.374z"/>
    <path d="M116.426 2.821l8.753 8.753-56.734 56.734-8.753-8.745z"/><path d="M127.893 37.982h-12.375V12.375H88.706V0h39.187z"/></svg>
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